half breastmilk and half formula

Britni

I have been an exclusive pumper and for this first month and developed a fairly good supply of breast milk in storage. My supply suddenly stopped and I will need to be switching over to formula soon. My question is, if I feed my baby half BM and half formula through the day, what are the best times to do so. I was thinking do BM in the morning and then switch to formula in the afternoon and evening. I just wanted to know what the best times to get BM are or if it even matters. I did read formula helps them sleep longer.

*I'm not wanting to do half and half in one bottle.

*My baby does not take BM from the breast.